Feed apparatus for steam-boilers.



PATENTED SEPT. 8, 1903. E. SGHOOF.

FEED APPARATUS FOR STEAM BOILERS.

APPLIOATION FILED SEPT. 12, 1902.

N0 MODEL.

ERNUT SCHOOF, OF

-Patented September 8, 1903.

PATENT OFFICE.

GHEMNITZ, GERMANY.

FEED APPARATUS FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 738,247, dated September 8, 1903.

Application filed September 12, 1902, Serial No. 123.174 (N0 model.)

Steam Return Feed Apparatus for Steam- Eoilers, of which the following is a specification.

The present invention relates to a return feed apparatus for the steam-boilers of steamheating or steam-boiling plants and the like, the purpose of which is to return to the boiler the condensed steam which accumulatesinthe condensed-steam-return pipe, this return being effected directlythat is, without a pump or injectorand at any temperature.

The improved apparatus has the advantage over similar apparatus hitherto known that it is operated solely by the difference of temperature between the boiler-steam and the condensed steam and also that it renders continuous feed possible and can be used with high-pressure and low-pressure boilers.

In the annexed drawings, Figure 1 is a longitudinal section of the apparatus; Fig. 2, a cross-section, and Fig. 3 a plan view.

As shown in Fig. 1, the apparatus comprises a chamber 1, closed by a cover 2 and communicating by a pipe 3, in which are a stop-cock t and return-valve 5, with the condensed-steam-collecting pipe and also by the ascension-pipe 6 (which extends nearly to the bottom of the chamber) with the feedpipe and through the latter with the water-- space of the boiler. By a tube or aperture 7and pipe 8 the said chamber also communicates with the steam-space of the boilers.

WVithin the chamber 1, on brackets 9, 10, and 11, an expansive body 12 is placed and provided at one end with a valve 13, the other end being controlled by an adjustment-screw 14, so that by means of the latter the expansive body can be adjusted according to the temperature of the steam in the boiler.

The pipe 15 discharges into the exterior atmosphere and is kept closed or connected with the exterior atmosphere by means of a valve 16,contro1led by a spring 18. The valve 10 is fastened to one end of a double-armed lever 17, attached to theinterior of the chamher 1, the other arm of said lever 17 being so fixed to the expansive body 12 that the open position of the steam-inlet valve 13 corresponds to the closed position of the valve 16, and vice versa.

The action of the apparatus described is as follows: When the valve-tube 7 is open and the discharge-pipe 15 closed by the valve 16, steam passes into the chamber 1 from the boiler, which is situated at a suitable lower level. If the level of the condensed steam in the chamber 1 has fallen below the expansive body 12, the high temperature of the said boilersteam will cause the said body to expand and will thus effect the closure of the tube 7 by the valve 13, which is preferably provided with Jenkins packing, the valve 16 in the discharge-pipe 15 being open at the same time. While part of the steam cut off in the chamber 1 is condensing and part of it is passing out through the discharge-pipe 15, Fig. 1, condensed steam from the collecting-pipe passes through the return-valve 5, open stop-cock 4, and pipe 3 into the chamberl until the expansive body 12 is covered by the cooler condensed steam, consequently contracts and opens the steam-inlet 7, and thereby shuts off the valve 16 and the communication with the exterior atmosphere through pipe 15, the return of the water being prevented by a checkvalve (not shown) in the pipe 15. This operation is repeated at intervals proportionate to the height of the expansive body, so that by suitably arranging this height or thickness the condensed steam can be made to flow continuously to the chamber 1 and from the latter in a continuous stream tothe boiler.

Having now fully described my invention, I declare that what I claim is- 1. In a continuously acting condensedsteam-return apparatus for steam-boilers, 0perated by difference of temperature the combination of a chamber, a pipe connecting said chamber with the water-space of the boiler, of a second pipe for conducting the condensed steam into said chamber, an expansive body arranged in said chamber, of a pipe communicating the steam space of the boiler with said chamber, an adjustment-screw arranged in said chamber for regulating said expansive body, and a pipe connecting the chamber with the exterior atmosphere, substantially asdescribed.

2. In a a continuously acting condensedsteam-return apparatus for steam-boilers, operated by difference of temperature the combination of a chamber, a pipe connecting said chamber with the water-space of the boiler, a second pipe for conducting condensed steam into said chamber, a stop cock and returnvalve in said pipe, an expansive body arranged upon brackets in the chamber, of a pipe communicating the steam-space of the boiler with said chamber, a valve attached to said expansive body for controlling said pipe and an adjustment-screw arranged in the ERNST soHooF.

In presence of- MORRIS LIPMAN, H. THIELE. 

